Sappers in the central province of Quang Tri founded a 240-kg bomb on April 19, when working on a project to expand the Lao Bao international border gate in Huong Hoa district.
Sappers pull the 240-kg bomb onto the ground surface.
Lying 6 metres under the ground, the weapon is 1.6 metres long and contains approximately 80 kg of explosives.
The low-drag general-purpose MK 82 bomb was said to be made and dropped in Lao Bao by the American army during wartime.
It has been transported to an area designated for the detonation of explosive devices found in the locality.
Since February, the sappers have unearthed five bombs with a total weight of nearly one tonne on the site of the Lao Bao border gate expansion project.